Répertoire du personnel
Emmanuel Vreven
Biologie
Vertébrés
Vertébrés
Détails
Braganca, P., Smith, T., Vreven, E. & Chakona, A. 2020. ‘Integrative taxonomy reveals hidden diversity in the southern African darters genus Nannocharax Günther 1867 (Characiformes: Distichodontidae)’. Journal of Fish Biology. DOI: 10.1111/jfb.14535. (PR).
Article dans une revue scientifique / Article dans un périodique
The present study explored the diversity of Nannocharax within southern Africa by
implementing three species delimitation methods for a data set consisting of 37 mitochondrial
cytochrome oxidase subunit I sequences. Two unilocus coalescent
methods, the General Mixed Yule Coalescent (GMYC) and the Bayesian implementation
of the Poisson Tree Processes (bPTP), and a genetic distance method, the Automatic
Barcode Gap Discovery (ABGD), were applied. Both GMYC and bPTP
delimited the same operational taxonomic units (OTUs), revealing a higher diversity
for the genus in the region than previously recognised, whereas the ABGD failed to
delimit the same candidate species. All methods delimited two species groups, and
these are supported based on colouration patterning and morphology; the
Nannocharax multifasciatus and the Nannocharax macropterus species groups and the
delimited OTUs were assigned to each. Two putative new species were identified,
Nannocharax cf. lineostriatus “Okavango” from the Okavango River in Angola and N.
cf. lineostriatus “Kwanza” from the Kwanza River system in Angola. The distribution
of Nannocharax dageti was confirmed for the Upper Zambezi and extended to the
Okavango system, and an identification key for the southern Africa Nannocharax species
is provided.